Is it normal to have relations with older co-worker?

My friend recently told me a story that shocked me. My friend told me that they had a sexual relationship with someone twice their age from work. I thought 'that's no biggie' but after a while things got strange . Apparently the co worker made some rules before the first encounter 'so the age gap wouldn't feel weird' the rules were simple. Each to only touch the others anus using any means including toys. Self masturbation was fine but any ejaculate was to be cleaned up orally by the other . This all seemed fine until the elderly party produced a large strap on dildo (my friend was not a virgin but was an anal virgin) and insisted it be used by both. They did this to each other my friend masturbated but couldn't orgasm while the more experienced ejaculated a lot near the end using manual stimulation. My friend, who was sore, unfulfilled and sad, then had to lick this up.
I know this isn't normal especially as the age gap was 30 years but my question is should my friend end this 'relationship'?