I already asked /b/ about it but they weren't very helpful. Let's see if /bant/ is going to be more useful.

Long story short, at my workplace there is a girl which want to fuck me and I want to fuck her. The problem is her boyfriend who's working with us.
I recently moved to a new apartment and I invited them over for a "party".
My goal is to put the guy to sleep early so I can take care of his woman without disturbance.
The question is, how to put the guy to sleep fast without making him suspicious?
>It's gonna be just 3 of us in home.
>I can't outdrink him, as he's taller and fatter than me (higher alcohol tolerance)
>inb4 don't fuck someone else's girl