I invited my brother over to help me put together some furniture. When he was done, I asked him what he was doing for the night. It would be fun to hang out with him like old times when we were young. "What did we even do? We just filled the time with so much! ...What do we do now?" He points out that I'm nipping through my shirt. "Okay? Stop looking, silly!" He tells me my ass has gotten bigger too. "WTF, no it hasn't!" I stand up to prove him wrong, realizing my ass is in his face. This is so inappropriate. "You won't get hard right? I'm your sister, like you're immune to my body, right?" He says yes so I tease him taking it as a challenge. "Hmm let's see how long you can last and not get hard from me teasing you". It didn't take long at all and soon I was fucking my brothers amazing dick. Ugh we're so bad