You're so magnanimous, you will share the bed as well

You tell Bera that since you're very understanding, not only you will allow Millie to stay with Bera but you will also help fulfill her natural urge.

Bera raises her eyebrows. "Lordling, yer wan to sleep wiv 'other man's wiv? Yer go'in to deeper 'ell fer sur'"

You tell her that you're going to be okay since you do your confession often. Then, you pointedly look at Bera's belly and tell her that she should start going to the confession booth as well. That remark earns a laugh from her who responds that if she goes to do it, the pastor will know it's her immediately as she's the only one who's pregnant out of wedlock. She doesn't really trust the pastor since he's known in the community to fleece the congregation like a flock of sheep. In fact, it was one of the reasons she stopped going to the church as he tried to solicit money from her even though she didn't have enough for herself.

Bera leads you to the main room. "Aye go an get 'er." Bera says before whispering, "Yer dinnae wan to came inside 'er roun tis time, not eif ye dinnae wanna sire yer bastard in other man's wiv,"

The warning that Millie's is most likely fertile fails to have its desired effect on you. Instead, all the warning managed to achieve is making you more aroused and your dick harder.

Then again, maybe that's what Bera intended when she gave that warning.