Oh, but don't worry. I don't go after straight people.

Literal

Ah but be-relieved-[request-してくれ]. I, straight [possessive-の] kid [to-に][topic-は] hand [object-を] not-put-out [reason-から].

ノンケ is Japanese gay slang for a straight/heterosexual person — possibly from 'non-気 (interest).' 手を出さない 'I don't make a move on, I don't go after' — 手を出す literally 'to put out a hand.' コ uses katakana for 子 'kid/person.' The speaker is openly gay and reassuring someone — casual and self-aware.