But as it was pointed out above Sansa would only have the option of marrying Tyrion or Lancel. Either way Sansa was fucked and yes Tyrion did take advantage of that to get himself a lordship. There was no way Tywin was gonna allow Sansa to marry Willas or anyone else BUT a Lannister. So yes Tyrion could have refused but the only good it would have done Sansa is she would be married to someone closer to her in age, someone who, as you pointed out, stood by while she was beaten. Tyrion was the very one who stopped the beating and Sansa even said he had been kind to her.

You bolded the sentence in that paragraph about Winterfell but seemed to miss everything else said in it. He wants to comfort her through her sorrows and make her happy. Yea you could say he might not have the right to, since his family is the cause of her own family's death, but its certainly not like all he cared about was getting a lordship. Maybe at the beginning but further on he wanted them to have a happy marriage and for her to be happy with him.

Tyrion couldn't have known that he would have to rape her to get her with child. He didn't want to rape her, which is why he told her he would not touch her until she wanted him to. He was hoping that eventually she would want him as much as he wanted her. (And I haven't gotten to the book where he does perform rape so I'm judging him by where he's at in the third - it's disappointing to hear he sinks that low)

I can't recall what he did in his Handship to stop her from going home. Was it the trade her for Jaime?