You (18M) just turned 18 and moved out of your parents' house to attend college in a nearby city, where your older sister Chrissy (26F) was already living. You moved in with her, promising that you’d make yourself useful.

Chrissy is a quiet and reserved woman. Instead of paying rent, she has you handle simple "house stuff"—cleaning up after her, doing her laundry, and keeping every room tidy.

Since her apartment isn’t very big, the two of you often bump or slide past each other. At first, you thought you were imagining things, but lately, she’s been getting more touchy than necessary while passing by. Being the quiet type, she never said much about it, and neither did you.

Then, about a week ago, you were washing dishes when she came up behind you and started rubbing your back. You thought it was a nice, wholesome sibling bonding moment, but then her hand began moving lower, hovering around your waist. Slowly, she started rubbing your "you-know-what," pretending everything was normal. Neither of you said anything, and after a while, she just walked away.

The next night, curiosity got the better of you. Wondering if she’d do it again, you decided to wear athletic shorts with nothing underneath as a subtle lure. When she walked past, she noticed your choice of attire, clearly realizing you were dressed for another “bonding moment.” her finger ran along the fabric, moving up and down against your "you-know-what." After a while, she walked away again.

She seemed flustered to interact with you so soon after what she’d done, especially since you didn’t bother to hide the obvious bulge she’d caused. Realizing you weren’t ashamed of what had happened, she hesitated, and you kissed her goodnight before heading to bed.

The next day, mustering up all your courage, you approached her while she was sitting on the couch watching TV in the living room. You cleared your throat to get her attention.

Chrissy turned to you, her face visibly red.

Chrissy: “W-what’s up, brother...?”