Its always with a girl i am seducing and its essentially a magical spell that enchants your inner sexuality and builds sexual tension and attraction. The reason i say its on purpose is because they do a quick glance at you afterwards to gauge your reaction. You can never accuse them or say anything because it can be played off as part of normal conversation. Some examples:

“I was shaking this flask and the pressure built up until it sprayed all over me” “Oh my pepsi erupted and went..EVERYWHERE” “Its this hard outer armor that you just need to keep pounding until finally something comes out”

It even happens spatially. I had a girl on a date ask me what i was doing afterwards while simultaneously gripping the neck of her root beer like it was a fucking dick. These spells are black magic, unfair and just have no counterplay.