Sexy Fun Times/Show Katie how boys jerk off
You pull your shorts down to expose your thick 8-inch cock to your sister's gaze.
"Wow!" she says. "It's huge."
"They come in all sizes and mine is a bit bigger than most. Vaginas are pretty elastic."
You lean back and wrap your fingers around your shaft slowly sliding the loose skin to the tip and then back to the base. You masturbate most days, often more than once, using either your imagination or some recorded porn for stimulation; doing it in front of your kid sister adds a new dimension.
Katie watches, fascinated as you begin to stroke faster working yourself towards greater levels of pleasure. You gather up some of the precum and smear it over your cock-head and grin as she involuntarily licks her lips. Soon you feel your balls begin to clench, and your hips thrust as if they are fucking. As your climax hits you and you get a feeling of pure bliss. Your cock throbs, twitching in strong spasms, ejaculating a series of thick spurts of cum over your belly.
You exhale a few long, slow pants as you come back down; Katie is watching, rapt by the spectacle. "Wow!" is all she says.
You clean yourself up and tuck your cock back into your pants. "Now you've seen me do it; how about showing me how you do it," you say.
"You want me to…?"
"Only if you want to," you say. "Maybe I can give you some tips."
She giggles and visibly relaxes. "I've never done it with anyone watching before," she says.
"What about your friend Kayla?"
She shrugs. "That doesn't count; she's a girl."
"You know what a lesbian is," you ask. She shakes her head. "Lesbians are girls who like other girls instead of men, just like gay men like other men instead of girls. Of course, there are quite a lot of people who like both."
"Do you like other men," she asks.
"Boys can be fun; I think I prefer girls though, especially pretty young ones like you."
She giggles at the compliment. "So what do lesbians do?"
"They can do a lot; the only thing that's missing is a cock, and if they want one of those, there are plenty of toys they can use. You can even buy an imitation cock that straps on almost like a real one, except as it never goes limp." She goes quiet, thinking about what you told her. "If you want to see, I've got some toys in the bedroom that belonged to an old girlfriend." You stand up and hold your hand out and she slips off the couch and allows you to lead her into the bedroom.