One of the guys (seriously, anyone is fine. I don't mind if it's one of big three or the more minor boys) gets strapped to a bed with a vibrating buttplug inside them. Whether they get freed or not by someone else is up to you, I just want them really hurting by the end of it.

Overhead, light flows across the ceiling, expanding and contracting like a slow pulse matching his own. His eyes are heavy and growing heavier with as indeterminate time passes. The pile of clothes under him shifts, his back arches further to accommodate it, he's drifting, comfortable and pulsing like these little specks of light on the ceiling. Slow and dimmed at first, Gamzee becomes aware of of his hand lying on his stomach.

Some time ago, Nie Mingjue gave this gift to Huaisang. Now Huaisang has found a way for both of them to enjoy it in a new way and he can't wait to share. From the text: “I just want to try something, if you don't mind.” Nie Mingjue watches him retrieve a box from under the bed. He recognizes it, it contains something Nie Mingjue gifted to Nie Huaisang. And indeed, that's exactly what his brother extracts from the box. A sizable pale green jade dildo, shaped after his own member. He gave that to Nie Huaisang before their relationship evolved into this. He didn't explain at the time, what it was supposed to look like, but it became very clear the first time Nie Huaisang saw him erect. By then he had familiarized himself with that shape and that size, and was delighted by this discovery.