Harry's impulse control isn't the greatest, especially not when there's minimal reason to stop and no Merlin shouting in his ear. Add in Eggsy, willing and enthusiastic, and Harry's got not hope of putting brakes of this anymore.

Both hands somehow find Eggsy's face, cupping his cheeks and jaw and holding him in the perfect position to kiss him. Even his words just bring a small smile to his lips. "Thank you for clarifying that, Eggsy."