TattPig is correct about the outside end of the catheter not fitting in your boyfriend's cock. That end is much wider and made to connect with a collection bag or other tubing. So find a funnel that fits it and have him hold it higher than your belly button and pee into it. Gravity will make it fill your bladder.
For a hotter scene, use 2 catheters and 2 collection bags. You and your BF cath each other up, attach the collection bags and unclamp your caths. Place the bag lower than your cocks and gravity will drain your full bladders into them.
Once you're both empty, clamp the caths off, detach the full collection bags, connect his bag of piss to your cath and your bag of pee to his cath. Lift the bags higher than your navels, unclamp and wait for gravity to fill you up with each other's piss.
TattPig is correct about the outside end of the catheter not fitting in your boyfriend's cock. That end is much wider and made to connect with a collection bag or other tubing. So find a funnel that fits it and have him hold it higher than your belly button and pee into it. Gravity will make it fill your bladder. For a hotter scene, use 2 catheters and 2 collection bags. You and your BF cath each other up, attach the collection bags and unclamp your caths. Place the bag lower than your cocks and gravity will drain your full bladders into them. Once you're both empty, clamp the caths off, detach the full collection bags, connect his bag of piss to your cath and your bag of pee to his cath. Lift the bags higher than your navels, unclamp and wait for gravity to fill you up with each other's piss.
