Well she had to get the edge on him in some way. Pleasure was a valid option. Especially when he stood to gain so much from it if he allowed her free reign like this every now and again.

Natsu's eyes widened as he felt himself get rolled over until LUcy was on top of him now with his hands pinned against the bed. STruggling was not even a halfhearted attempt before he relaxed under her control again. Cruelty? Teasing? It was definitely both of those things at the same time.