Stepsis promised me a blowjob

I know it's fucked up cuz she's my 18 y.o. stepsister and all and our parents are sleeping in their bedroom as we get down and dirty in a living room, but I was so horny and she promised me a blowjob for lending her money for shopping. Damn, I thought she'd only suck my dick, but we ended up fucking as well and let me tell ya, that tight moist pussy was worth every dollar I gave my slutty stepsis. I guess I'll keep giving her more, you know.