He loves the Undertaker. He honestly loves him, but the older God of Death only holds him, makes love to him, and let's him go back to William. Every time he leaves he wishes that the taller man would ask him to stay. Undertaker must know that he's also sleeping with William. Its so obvious; hickies in places the white haired man doesn't kiss, marks over the spots that he does. He knows and he doesn't even care.
Grell wishes that Undertaker would ask him to stop, ask him not to sleep with others but he never does. Grell wishes that inside if the older man, SOME part of him would care, but his hopes for that died a while ago.
When he finds himself being taken on top of a shiny new coffin, he grasps at the man inside him, milking it for all its worth, but this time he doesn't come. Undertaker pulls out and notices the younger man going soft, without having released. He rakes his fingernails lightly down Grells ribs and watches his cock twitch, but that's it. Grell stands and pushes Undertaker away, silently getting dressed.
"This is the last time. It was fun." Grell grins a morbid grin and blows the older man a kiss before turning on a finely pointed heel.
He hears Undertaker chuckling darkly behind him as he struggles to keep up his facade of nonchalance. He's almost out onto the street when he's pulled back into the dim building, arm around his middle, hand pressed slightly to his lips; and they are silent for a moment. Grells hand clenches in the thick coat of the man holding him.
Then the silence is broken, and Grell hears the taller man whisper,
"Don't go back to him."
And he doesn't.