I have so many questions lately! Sorry! What other terms relate to imposing upon someone or being burdensome to them? Thanks (again...)
how about
disturb
interrupt
take s.o. away from sth.
they might be more for butting in on someone's party rather than asking a favour though.
which one do you mean?
pester, bother, intrude, have a little of your time,
could you spare a little time