Maybe he wasn't. Maybe they both had their share of the blame. Well it didn't really change anything. Right now, Natsu could focus freely on making up for last time. So of course his next actions lacked any of that prior hesitation.

"You're warmer than any flame I've ever had~" Natsu purred as his lips slowly moved over her breast before he softly gripped one and squeezed before brushing his tongue over the crown of her breast.