Helping a friend is a sacred thing—especially when it’s just a trifle. You only need to take him on vacation and pretend to be his lover, so as to dispel some suspicions his mother has.
Add to that the fact that your friend knows your very dangerous secret, and that meeting his parents also comes with the opportunity to visit one of the most beautiful duchies of the Empire—so there will be no reason to refuse.
The main thing is that the older brothers of this “lover” don’t find out and don’t rush to come see the future relative. Because there won’t be a wedding anyway—even if someone has firmly decided that this wonderful little girl simply must stay in the family!