I've only had to use tissues for my snot (when I had a cold).

I'd taken along my own set of tissues (and for good measure, a handkerchief but didn't use the handkerchief coz in the past, people have given me weird don't-spread-germs-with-that-thing looks when I've pulled it out) coz I didn't want to use her tissues coz well, snot etc.

She found it strange that I'd take along my own tissues when she has three tissue boxes.

I still used my own tissues.

I seriously doubt I'd use her tissues even if I were to cry (I'm not sure when that'll happen, if ever) -- it's just too.....ugh.......icky or something. I've considered using my t-shirt at times that I've feared I was tearing up a trifle much but thankfully, the situation has never gotten serious enough to warrant such action.