Too Wicked to Love — Barbara Dawson Smith

He is Ethan Sinclair, the Earl of Chasebourne, the most notorious rogue in all of England. She is Miss Jane Mayhew, the keen-witted spinster Ethan had never even noticed. But when Jane discovers his love child abandoned on her doorstep, she is determined to see him face responsibility

If it weren't for the baby she claims is his, Ethan would have nothing to do with her. The last thing he wants is to become involved with the prim and proper Jane. But sometimes, the last thing you want is the one thing you need...