Ratboy calls you sweetheart.
Actually, he calls you by a thousand names. Honey, baby, dear, darling, bunny, babe, all of it at random times, he's a pet names sort of fells.
But sweetheart is what he calls you most of all.
It's classic and it's sweet, just like you. And it's the name Ratboy always uses in the most loving, intimate moments of the relationship. The times when he needs you the most and is loving you so hard that it hurts. But it's a kind of pain that he like, sweet and heavy and his, all his.
"Sweetheart?"
It's been a long fucking day.
He's tired, he's broken, he's bleeding, and all Rat wants is you. He knows you're waiting for him. You always wait for him when he's away "on business" and he's not wrong. Candlelight draws him into the bedroom, your shadow flickering on the wall.
"Oh, Rat, what happened?"
"Nothing," he mutters, his voice low and deep. "It's nothing, sweetheart. Just stay...stay with me."
And you do. You stay with him, shadows dancing as Rat pulls you into his embrace and never lets you go throughout the night. He's a simple guy and he doesn't need much to be happy...just his sweetheart.