My Stepbrother-in-law Enjoys My Pussy and My New Lingerie Before My Boyfriend, His Big Cock Makes Me Wet All Over

I bought the red lingerie to surprise my boyfriend on his birthday, but when I tried it on in front of the mirror in the guest room, the door opened without knocking. It was my stepbrother-in-law, my boyfriend's older stepbrother, who had stayed in bed after dinner. He stood still in the doorway, looking me up and down, and I didn't cover myself.