Family Ties/Ask Heather what she is talking about.
"I've seen the way you hug her, always groping her titties and making her moan," She said and began to jerk you a bit faster while you began to suck her nipple harder. "You think you're so sneaky but I've been catching you doing that and more."
One of your hands come up and pinch her right nipple and made Heather moan. Her free hand slipped down her pajama pants and in between her legs. "More?"
"I watched you peek on her while she's changing and in the showering, seen you jerk off in your room as you said her name," Heather's jerking became faster now to match her heavy breathing. Her face was red and body was beginning to tremble slightly. "You know how painful that was to watch? My own baby brother choosing our old mom over me? A sexy teenage girl that can go longer than our mom ever could."
You had no idea Heather was watching you or felt this way about you. Popping her nipple out of your mouth, you said. "Sorry Heather."
Heather giggled and stopped jerking you off, just short of you cumming. "Oh I know you're sorry but you have to show me that you really are." With that, she stripped off her pants to reveal her dripping wet pussy to you, ready for a good fucking.
You sat up against the head of your bed as Heather positioned herself over you to ready you cowgirl style. A second later, she speared herself on your rod and let out a loud moan of pleasure.
"Oh god, this feels so good" She raised herself up and dropped down and it wasn't long until Heather began to build rhythm. You weren't idle during this and thrust your hips up to go even deeper into your big sister while you sucked and bit at her nipples. "Yes Timmy, fuck your big sister! Make me your fuck toy!"
Her pussy was incredible and wrapped around your penis like a glove. Her warm insides massaging every inch of your cock and your tongue eagerly licked her hard nipples. Your bed creaked and shook as your fuck went on, adding to the noises that the two of you were making.
It wasn't long until you felt the urge to cum rise. Do you: