It's a slow push, a gentle burn, and Steve hisses a little, but he's never felt so filled in his entire life, and it's a feeling he can't get over even as it happens, even as he looks down to see Danny's hips pressed flush against his body, and he very nearly whimpers in the back of his throat, scrambling to grab Danny, to touch him, to anything while he's deep inside. "Danny, Danny, oh, fuck," he whines, laying back and resting, leaving himself open for Danny to do the taking.