Things to turn him on even more during tickle fights?

Me and my best guy friend both like each other and we are very flirtatious when we hang out. We are both very ticklish so we always end up in a tickle fight and I know that it turns him on. What are some things I could do to kinda tease him I guess? Make it hotter/more sexual and get him wanting more if that makes sense?
Things to turn him on even more during tickle fights?
Post Opinion