Sure, sounds good in the short term. Probably better in the long term to be honest and figure out something that lets everyone to have an orgasm though.
This assumes that the person faking it expects continued interaction and/or safety. Women often fake it with flings when they simply want things to finish and don’t want to have an awkward conversation with the person they never intend to see again. They also fake it to avoid confrontation due to perceived emasculation.
Now, if you feel safe in your non-transient relationship, this is literally the best advice in the world.