Sometimes Kurt forgets that what first drew him to Blaine was his confidence.
Here, Blaine is quiet and subdued, missing the secure familiarity of Dalton. He's given up everything safe and familiar – and sometimes, lately, he comes across as just a little… insecure.
That's why it catches Kurt off guard when he sees him, taut muscles rippling under the surface, unruly curls plastered to his forehead as he throws his strength into every blow – and suddenly, Kurt finds his thoughts moving into an entirely different place.
He smiles, blushing already, as he pulls out his phone and composes a text.