could ついーっ (tsuii-) be a stroking sound?
e.g 'stroooke'?

could we consider it yuri

mlavx said:
could ついーっ (tsuii-) be a stroking sound?
e.g 'stroooke'?

Yes. It's more commonly written as つーん or similar due to its relation to つん (poke).　　ついー seems to suggest a smooth surface.