You need to choose the "About me" option when Jason confront his mother at the end of the new update.
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But to have this option available you need to be first on the incest path. I didn't get it on my first try. You have to reject any advance from girl other than your mother, tell her she is the best. Which should give you unlock the choice "I want to stay with you, Mom" just after the first plane sequence.
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That give you access to a special incest sequence and from this point on you must view/masturbate to any video you receive of your mother which unlock the cuckholding path.
I know it sound a bit long but it's quite logical.