The twins felt their heartbeat quicken. Even if they had their fair share of partners they've never been that way with any of them.
It's not that they don't want to it's just that they felt that they could only be this way with the person they would spend the rest of their life with.
Of course, they want to share that moment with Cillian they just never thought he would want to. Ren asked:
"Are you sure?"
Cillian nodded.
"I am don't you want to?"
From the way, the twins were reacting Cillian felt like he was missing something. Tian said:
"We do we just want to make sure you're truly okay with that."
Cillian tilted his head and then asked:
"Have you ever done that with someone else?"
Ren said:
"Never."
Cillian looked at them surprised. His Gege certainly like to have fun so he believed they had done everything.
Tian said:
Love's Alchemy: Breaking Shadows