What if they start kissing except their lips like they started ‘I love you’ thing. In standing position Steve easily kisses Danny’s forehead or temple or wherever he can reach which (barely)
look like friend-to-friend kissing. A light kiss.
But Danny can’t reach those spots because of their height difference, so he kisses Steve’s jawline or cheeks which look like more intimacy than Steve’s. Every time Danny kisses him like that, Steve can no longer stand it, then he finally kisses Danny’s lips.