My grandfather died when I was about fifteen, and my grandmother never remarried. I had always wondered why, and sometimes I wondered if she dated. She would come over, and I used to wonder what she looked like naked, if her body was still in good enough shape for a man to be interested. She wasn’t bad-looking at all. She had dark, jet-black hair, and I figured the color came from a bottle. Hell, I didn’t care. A person of 49 has to do what they have to do in order to look good, I figured.

She had good-sized tits, and I didn’t see too many wrinkles. She took good care of herself, and she looked just fine to me. Just the thought of her having sex began to excite me. I wondered what it would be like to have sex with her. I suddenly realized one day, as she was sitting across the table from me just chatting away, that I had the hots for my grandmother. I actually went from the thought of wondering what she did for sex to the point of wanting to have sex with her. I really didn’t know when the thought changed.

It actually shocked me, to think that I was sitting there, getting a hard-on from looking at her tits straining against her blouse. I hadn’t realized until just then how much a part of my sexual fantasies had lately been devoted to her, to thinking about what it would be like to suck on her tits and have her fondle my hard cock. I sat there, red-faced, hardly listening to her conversation as I stared at her tits.

She interrupted my thoughts by an announcement that she had bought one of those new, above-the-ground spas for her house. It would be installed in her backyard, close to her patio, she said, and it would have a bar, and a gazebo on top, made of red wood latticework. The way she made it sound, it seemed like a paradise. She was going to plant bamboo around the perimeter and all that. “I’d be more than glad to help you with it,” I heard myself say. I didn’t know why I said it, or what, exactly, the work was going to entail.

Her eyes widened. I had never volunteered to do any sort of labor, ever. You know, I was a major couch-potato type of guy.

She looked at me and beamed at me with one of those smiles of hers. “Great,” she said, “next Saturday, I think we should put the plants in then.”

The next Saturday, I arrived at her house and took a good look at her new spa. It was already running, and the water was nice and warm, but there were no bubbles. She had turned it on low, the way she liked it. It would heat faster on low, and then later, when the water got really hot, she would put it on ‘high’ and turn on the bubbles.

There were about fifteen large pots of bamboo and all kinds of other tropical plants, just waiting for someone with a green thumb and some energy to start working. That was me, I thought. I had a big mouth. I could have just shut up about it, and one of my cousins would have been over here, helping her with it. But, as far as I knew, no one in the family other than me had the hots for my Grandmother. I wondered, absently, what she would do if she knew that I wanted to fuck, suck, and fondle her. I got red-faced, just thinking about it.

I worked my ass off for about three hours, and dripping with sweat, I had dug the last hole and planted some type of enormous, broad-leafed thing that looked more like a tree than a tropical plant. Tarzan could have hidden in the thing, and no one would have been any the wiser. The damned thing must have weighed about eighty pounds.

Grandma stood there and surveyed our handiwork. It was gorgeous, with the plants hiding the spa from just about any angle. There was a small concrete and rock pathway that wound around some of the plants. It truly was a paradise, right there in her backyard.

“I’m so pleased, I don’t know how to thank you,” she said. “You need a shower and some lunch, and a nice cold drink to go with it,” she said.

I went into the house with her and took a shower, wrapping a towel around me when I was done. I was surprised to find, when I walked into the kitchen, that Grandma was in a bathing suit.

“I’m ready for a quiet, relaxing time in the spa,” she said with a smile. “You will, of course, help celebrate it by getting in with me, that is, as soon as you’ve had a sandwich and a soda, OK?”

I nodded, taken aback by how Grandma looked in the skimpy bathing suit. Her tits were, indeed, big and round, and her legs were smooth and muscular. I could feel my dick jerk up and begin to grow, just underneath the towel wrapped around me.

“I’ll get you a robe,” said Grandma, “but for now, just sit and have a chicken sandwich.”

I started eating, sometimes pressing down on my hard cock, trying to find a comfortable position in which to sit. It wouldn’t go away — the more attention I paid to it, the harder it seemed to get.

“Here you go, Martin,” I heard Grandma say. I turned, and she stood there with a short terry cloth robe in her hand. She looked at me, and then down at my crotch just briefly. There was the hint of a smile on her face.

I took the robe and put it on the chair beside me as Grandma sat across from me. Her sitting there didn’t help the hard-on go away at all. It just made it worse. It wasn’t my fault, I couldn’t help it that I was aroused, in fact, I wished then that I wasn’t.

“OK, let’s go christen the spa,” she said with a smile.

“I don’t have any trunks,” I said.

“Well, there are some undies,” she said. “Or, you can go as you are. I’ll turn my head, and the bubbles will hide you anyway.”

I swallowed. The thought of being naked with Grandma in the spa really thrilled me. I didn’t know how to act. I would probably cum in her water, just from sitting close to her like that.

We went out to the spa, with me carrying the robe and wearing the towel wrapped around me. The material rubbed against my hard dick head with every step, and I thought I would cum before I ever got to the spa.

Grandma was the first to get in, and she flipped the switch, putting the jets on a higher flow and making bubbles shoot up. Then she looked at me. “I’ll turn my head, and you jump in,” she said.

Sure enough, she turned her head, and I got in the spa. The water was warm, and it was extremely comfortable and relaxing after having worked so hard to get all the plants in the ground.

“A glass of wine,” she said, “we need a damned glass of wine.” As she got out of the spa, her leg came into contact with mine, and she tripped slightly and reached down to hold herself up. Her hand went right into the water, pressing against my hard, aching dick!

She pulled her hand away and looked into my eyes. She didn’t say a word, just stepped over the edge and let me look at her sexy ass. With her legs parted, I could see, up close, hairs poking out of the crotch of her bikini bottom. My cock jumped.