Even if Si Rong didn't want to admit before that they'd had relations, he had to do so today! Feng Xiuyu was determined to publicly announce their relationship to force Si Rong and the emperor to make her his official wife!
"Doctor Su already said that you couldn't have children anymore, and I didn't despise you. But now that you've had relations with someone else, I really…" Si Rong put on a pained expression. "If you can tell me who the other man is, I won't pursue this matter."
As long as Feng Xiuyu did not implicate him, he could still let her be a consort of a lower status since she was a daughter of the Feng family. That way, he could still keep his prospects while looking like a faithful and loyal man.