Hottest thing was several years ago. She (my gf at the time) and I both were in our mid-20's, and were fairly active sexually.
We were at her apartment and she stepped into the kitchen area to make some Kool-Aid - I think her niece was having a birthday party the next day and she was putting some stuff together - and I volunteered to help.
The next thing I knew we were all over each other. Oddly I don't recall what sparked it, exactly...but damn it was hot!
Afterward, one of us asking the other if they'd come and "help make some Kool-Aid" became our codephrase for a quickie.
Ah, those were the days...
