Tonks hadn't had a first kiss in awhile. Since... she couldn't remember. There wasn't anyone serious for awhile before Remus. And this was a wonderfully wonderful first kiss. Those butterflies and fireworks were flying and exploding in her stomach at the same time.
The kiss was nothing and everything at the same time. Tonks closed her eyes and kissed Oliver back slowly, enjoying how natural and simple the moment was. But before she could lose herself too much, Remus' face came to mind and Tonks jerked back suddenly.
"What the hell am I doing? Oliver.. I can't. I'm sorry. I like you, but Remus.."