sharing a toy between partners mid-play — soft or full in ur book

random one but its come up twice now. couple we play with brought a wand and at one point it got passed around between all 4 of us. like the OTHER guy used it on my wife and i used it on her. it didnt feel like full to me at the time but afterwards i kinda kept thinking about it. does using a toy on someone else's partner count as crossing into full for u? does it matter if the toy never penetrates? im genuinely not sure where this falls and id rather have a definition next time than figure it out in the moment again