People don't normally hit on me, not that I'm good at noticing or believing it, although I can even foresee such things between others.
If and when it does happen, however, it really depends on the person and my current mood. Often I may feel doubt or confusion, sometimes I'd feel anxious or nothing, rarely I may feel enamoured. It can be a mixture of those. But if it's merely jester, then I may just return the favour. 😼