Nibbling is often fun for him and for me - i nibble his pecks as I ride him and it gets him more excited and occasionally he even likes when i do it hard. Also a lil light bite while going down on him can also be enjoyable on his end occasionally.
I like a few nibbles around my breasts. I also like the feeling of fingernails dragging down my back and arms, as long as my boyfriend keeps his nails short.