His smile was soft at the mention that Gaara would hold him to that. His hand gently tightened on the other redhead's, "I wouldn't expect anything different."

As for Guy's words, Luke could only glance to the side, finger reaching to scratch at the side of his face. The hint of color on his face darkened the more Gaara talked, though. It was after hearing the part about their hearts, however, Luke wished he wore something with a hood...so he could slowly pull it down over his face.

Though, on the same note, he wasn't surprised...which might have been obvious. Awkwardly shifting in his stance, the building over yonder seemed to be the most interesting thing in all of Crystallis. Honestly, Luke might have matured since his travels, but nothing could have prepared him to have his best friend and boyfriend meeting after that much time.