"What should I do? "
Since all of u are joking, he wont treat the words that u say
seriously... But usually, if it is a girl that request to stop, the
guy will stop lah... if it is the guy that request to stop, the guy
will continue 1... lol ... u can do those points below :
1) Change topic
2) Suan him... And if people thinks that u r right, they will join
u...
But it is strongly not advisable to report to manager or hr... Coz,
all of yr collegues noe that it is a joking session... If u r the
girl, then, talk with yr other female collegues... See what they
think... Probably, can gang up together... If u r the guy, alamak,
come on lah...