Morrigan's Ritual

After learning that a Grey Warden must sacrifice themselves to kill an archdemon, the Warden would then be approached by Morrigan to offer a solution to ending the Blight without the need of a Grey Warden's sacrifice: An ancient ritual that involves her being impregnated by a Grey Warden, allowing her to transfer the archdemon's soul to her unborn child upon its death, freeing the soul of darkspawn taint in the process. If the Warden is romancing Morrigan up to that point, they may then ask her if giving birth to an Old God-infused child was the reason for their relationship, to which she refutes by saying that while her feelings for them were indeed genuine, she never actually planned on falling in love with them in the first place and she would insist that they perform the ritual with her to spare her beloved from making the ultimate sacrifice.

Example of:
Deus Sex Machina