Office mate is pushing for affair

SHOULD I finally sleep with my horny colleague?

We’ve been flirting on video calls since the start of lockdown.

Now we’re due back in the office and she says “it’s time”.

She’s in a long-term relationship but swears a little fling won’t hurt, because her fella won’t find out.

She’s now making me feel as if I “owe” her a thrill. Do I?