You tell him you know, but you want

You tell him you know, but you want to, and you swear you can see him blush. "Anything for you, sweetheart," he says, and he fiddles with something you can't see below the couch, and there's a familiar hiss before he brings up his gently beating heart. Oh. You remember that. He hands it to you gently, and you're a little afraid it's going to burn you, but this time it's simply pleasantly warm, like a cup of tea. The surface is slick with mysterious pink goop, and as you run your thumb over it, you can see him biting his lip again. You smirk just a little, and bring the heart to your mouth, letting the warm syrupy liquid fall over your tongue and down your throat. It does taste like cherries, you note right before Mettaton goes back to his business between your legs.