You and your sis are super close. So close that it's no big deal if she walks in on you beating off. It's totally cool. Sometimes she even helps you! Like today, when you're sitting in the living room beating off to porn on her laptop. She comes into the living room after taking a shower and sits down on the ottoman in front of you. You keep stroking as she yaps on about what she should make for dinner. Briefly, she takes the laptop and checks what you've been watching, casually asking you to bookmark the video for her to watch later. You're not really sure why she keeps hanging around but once she takes off her towel to dry her hair, you start to beat it faster. Lucky for you, she's in the giving mood as she asks if she can suck your cock. You're not one to turn down such an offer so your sister gets on her knees and goes to town. Every so often she tries to talk, but her mouth is crammed with cock. She pops your cock from her mouth to ask about the upcoming dance, family vacation, whatever, in between long strokes into her tight and talented throat. You watch your sister slurp and worship your cock, building you up to an intense orgasm. She makes you promise not to cum on her face this time, "I don't wanna have to take another shower!" and you happily oblige, unloading a thick load onto her waiting tongue. She slurps it all down before laying back and quickly masturbating, licking her own juices from her fingers before standing. "Maybe I'll just make pasta and sauce?" she muses, "yeah, that'll be easier. Alright, later!