Me and my sister are close, like really close and we’ve been best friends for years, telling each other everything and all around being practically perfect siblings.

So, on tik tok I saw a bunch of videos about women on periods, specifically about what point in the cycle that they are most horny because, me and my sister usually always hear the joke “you two look so cute together” or “if we weren’t related we’d definitely date bc we know each other very well” so I thought maybe she was hinting at something whenever it got brought up. Anyway, she has been a period for a day or so and around the time where they’re considered “in heat”.

So it’s yesterday night, we have family over in the living room and neighboring rooms just hanging out and chatting, me and my sister always preferred being alone together to play video games always from every one. So we’re talking about god knows what and the tik toks brush against my mind as she seems distracted from the game, mind you, she’s a sweat lord at most games so it’s definitely odd seeing her zoning out like this. So I crack a joke about her being my girlfriend and how I’d be able to always ask her what’s wrong whenever she feels some sort of way. She laughs, and I move closer to her and ask “but like, seriously tho, what if we did get a bit closer to each other?” Mostly joking ofc but also semi serious.

She laughs it off at first but when I point out how close we are and how we awkwardly act whenever someone mentions we look cute together, I can see her pondering the idea. After some needless dialogue, we actually kiss on the lips, as I feel her pulling me close to her, like she really needed me in that moment. Ofc we make out a bit in silence bc my grandparents are nosy so we try to keep it on the dl.

Now I really wanted to go the whole way with her but I knew she’d be extremely fertile and I don’t have a condom. So I asked if I could use her tits because, honestly she has always had an amazing pair. And she’s in a crop top with a regular bra so we don’t have to completely naked and risk getting caught. So put my dick in between her tits and trust, and let me tell you, doing sexual acts with someone you’re really close to feels like heaven.

Her tits were so soft, they felt even better when she used her spit as lube. So I’m fucking her tits like a wild animal and lo and behold the nosy grandparents show up banging on our door to let us know that dinner is ready. Stopped in time not to get caught and went about the night as normal as can be. She went to go hang with our cousins and will be back tomorrow night, I think I’ll want to see her.