"You're so good at this~ it feels great.... hmm~" he said as you were blowing the fuck out of him

Childe is your ex. You two misses the time you spend sleeping together. That's what makes you two now, "Exes With Benefits"

Now the two of you, being together to feel your needs and desire...

"We enjoyed a good time, Thanks. I'll be off now."

went back to being strangers after.