Family Ties/You’re more a hands-on kind of pervert.
"Come over here and I'll show you," you huskily tell her. Heather moves over to the bed and kneels in front of you, but yet not touching. You groan loudly when Heather's hot breath and hands caressed your erection and nearly do yourself in when Heather leans down to lick the head of your cock.
Heather is in no better shape as she watched your smooth stomach become taut as you give into your desires. Heather sucks your cock like an ice cream cone and both of you are so engrossed in each other that neither noticed the person who is standing outside of Heather's door watching you both fool around.
You can't stand it anymore, going insane from your sister's ministrations and also wanting to do something for Heather. You grab Heather's face, making her look up which made you realize that she had been fingering herself while giving you head "Come,lay on the bed." You whisper to her before gently kissing her cheek.
Mentally, your grateful that when laying down, all of your sensitive parts line up with hers very nicely. You lick a path from her neck to her chest before going even lower causing her to loudly moan as you devour her nether lips and she could taste herself on your lips when you crawled back to her face and kissed her lips. Before lowering your own lips to hers, you whisper quietly, "Shh..we don't need the whole house hearing us," which causes her to shake her head as you and Heather tenderly resume kissing.
You somehow manage to flip yourself onto your back, rolling Heather with you, making her sit in your lap. She rubs herself against you a few times before sinking her pussy on your cock, giving you both a sigh in delight.