I mistakenly put my girlfriend's sister in my mouth and immediately fucked her... and then I came inside her! When I suddenly inserted my dick into her sensitive pussy, she came instantly, and the first super pleasure I've ever felt made my devilish sister want me to have sex with her again and again, creating a chain reaction of pleasure! My begging for sex escalated as I mistakenly put my dick in her mouth when she looked exactly like me, gave in to temptation and came inside her three times in a row, had sex while trying not to make a sound, had sex with my sister at night while she was sleeping, and had sex with her in the middle of the night when my morning wood came in.