Jerking With a Bud
COME PREPARED
People have wildly different ideas on what a masturbation session should look like. Having some lube and paper towels available is always a good idea, but from there on it's up to you to find out what your partner would find arousing.
Some guys like to use toys to enhance their experience - Fleshlights and other varieties of "pocket pussies" are probably the most popular here with buttplugs and prostate stimulators being close second. Some get off on pressing a strong vibrator to their cock and I've also experienced buds suck on a dildo while they watch a blowjob scene. Another popular thing to do for extra immersion is having multiple screens play different videos simultaneously.
Make sure to discuss preferences before you get together, as it can be very off-putting to expect something very tame and then walk into an equivalent of an S&M dungeon.