Cas morphs back into his human form
Cas: Yeah...but I really didn't wanna stay...
He shoves his hands in his pockets, looking at the ground. He seems really ashamed and guilty
Cas: I...I'm sorry...
Cas: For...for everything. Everything that happened yesterday...
Cas sighs, running a hand through his hair
Cas: Look-if you like Katsuki...well I-I'll back off. I'll leave you both alone...