HOUHHHH
every once in awhile I think about the idea of Childe buying a pump…. Maybe he caved after a bad bout of mockery in a locker room. Or he got drunk and bought it. Or curiousity just got the best of him. Either way he has a pump in his possession and he tried to use it on himself once…. Ended up chickening out bc it was Too Much. Didn’t do much besides make his dick kind of sore.
Zhongli finds it though after awhile, comes across it by accident. Plays innocent just to watch Childe stammer and avoid saying what it is when he asks “oh? What’s this?”
“Oh— uh…. I-it’s for this new cupping therapy…. That uses suction. For your muscles.”
“Is it really? Because it looks more like….”

Cue a nice demonstration to show Childe how to actually use it. (“Why can’t we use it on yours first to show me how it’s done??” “Mine won’t fit, dear.”)

I just need Childe tied to a chair and left with the pump on his dick. It takes awhile to give results, after all. And the longer they leave it… the better it’ll be. Meaning Childe has to sit and wait and squirm until Zhongli decides it’s been long enough.

Godddd. His dick all swollen and red,, and extremely sensitive. Every little touch makes him jerk or shudder because it kind of hurts and feels so intense. His entire face scrunching up and his body stiffening when Zhongli finally wraps a hand around it and just purrs… “look how thick it got~ so warm, too….” While he strokes it and poor Childe is nearly shaking because everything feels so intense. The first time he’s had a cockring used on him and it actually felt tight..

Childe tries to use it more frequently after and for awhile Zhongli just assumed Childe found out he really liked it…. Turns out that initial insecurity kind of lingered and Childe let himself think for a bit “does Zhongli prefer it when my dick is bigger,,,,?” And Zhongli has to insist it was just for the scene/session he likes Childe’s small dick more,, it’s more fun to play with and Zhongli could never dislike the way Childe is naturally. The pump was just a fun way to try smth new and he liked how whimpery and whiny childe got after using it