Been watching or reading Beastars?

OH YES!!! Water, Machine, Plant, anything to do with tentacles, oh and anything else I missed...

What?

Maybe a heart monitor that goes the ass/pussy if subject is in heat, and then the steth' could be really cold to the touch and make the subject twitch, or heated too

Well have options to rule that out so its either cum or piss...

You could have injections to enhance them too...

PS: Oh and if test subject is getting fucked orally, up the ass, or into the pussy, cum could be forced to travel to breasts but some function and then mix with milk and be forced milked out and maybe even back to fucker in any of avobe 3 pathways...then LOOP like a sideways 8