Sit on his lap

You sit down on Bob's lap. He pulls you right up to his clothed dick. His erection is obvious and pushes firmly across the bottom of your dress. You can't help but take in you breath, deeply, unable to control your own growing arousal.

https://www.pornhub.com/view_video.php?viewkey=2111231397

Bob quietly puts on the porn video, which, after a lengthy intro, starts with a girl dressed up like a princess, just like you, stroking a man's dick through his pants. Bob says, "better get started." You quickly comply, mimicking the girl's movements as best you can.

The porn actor commands the girl to "suck his dick," and both you and the blonde porn star comply, fishing out your partner's cock. You start sucking his dick, thinking to yourself that you're starting to get good at this. Bob seems to thinks so too, as you take more and more of him deeper into your mouth. You feel like such a slut. You do your best to copy the porn star, moving from taking Bob's cock up and down on your mouth to lustily licking his cock up and down. "Get it good and wet," Bob ominously orders you. You know what is coming.

The porn stars get up and the man takes off his pants. You and Bob do the same. The guy pulls the girls panties down and hikes up her dress over her waist. Both her, and soon after your, asses are exposed. The girl starts getting fingered in her pussy, and sure enough, you feel Bob insert some fingers up your asshole. It's uncomfortable at first but this whole situation has you more turned on than you've been this entire week.

After a bit more fingering, pretty soon, the porn stars start fucking. You and Bob glance at each other. This is the moment of truth. What feels like the last line the two of you haven't quite crossed yet.