Last month I was over at my aunt's for a long weekend since there was no school on a Monday. She is a lesbian, in her mid to early 40s. She's not really that pretty aside from a pair of huge tits (probably E cups). Her partner has even larger breasts, but is less attractive.
On a Saturday afternoon, I was home alone. My aunt was running some errands for a couple of hours and her partner was visiting her mom for the whole day.
It was a hot day and so I decided to take a shower. My aunt's shower is great, with an awesome showerhead and what not, so she lets me use it whenever I want. I started feeling horny, so I began to jack off.
After about 15 minutes the door opens and my aunt comes in saying 'Hey honey, I didn't know you were back already. I just forgot something and I'll go back to the store.' Before she finished the sentence, she looked up and saw it was me in the shower. She apologized, and I said it was Ok. She then noticed I had a massive erection and smiled a little bit. She then asked 'what were you doing there, huh?'
It was pretty obvious, so I just said 'sorry, you got me.' I was surprised when she asked 'do you mind if I stay and watch you finish up?' I said sure, and proceeded to jack off. She wouldn't stop starring at my cock, biting her lips. I then said I needed something to drive me over the edge, and asked if she could do anything about it. My aunt undid one of the buttons on her blouse, and looked at me as if she were asking 'is this what you mean?' I nodded, and she quickly opened her blouse, undid her bra and exposed those massive hooters. She began lifting them a bit and playing around, which just made me shoot all over the glass.
For the rest of the weekend, we continued to have sessions like this. The only time we touched each other was when she let me feel her amazing tits. Once I was back home, my aunt said she told her partner about it. I wonder what's going to happen next time I'm there.