[He takes that as an invitation to move closer. His optics dim and he leans his forehead gently against Prowl's. This contact is so desperately wanted that, at that moment, he'd do anything to keep it this way. Optics brighten again and he looks into Prowl's eyes, inviting him even closer if he wants to.]

I know you do, and I appreciate everything you do for me.

[He wants to say it again. Another "I love you". But he doesn't know if Prowl is ready to hear it again.]

I'm sorry about all the trouble I've caused you. It must be a real pain to have me around, huh?