"I promise to be very gentle with you, Senku-chan," Gen said, teasing but entirely sincere.

Gen hummed. "I suppose it's a good experiment, if nothing else. Though, we'd need to make sure we're filling both our cards so we'd both get home about the same time ..."

Which is why he blinked at Senku. "Ah, my dear ... while I doubt it's entirely practical to remain, ah, strictly monogamous in a prison like this one ... if we both like each other, why not help one another out with our captors' requests?"