The Rough and Deep Second First Love

"Nao", who lost her family as a child, loses Arata, her fiance, her only support in an accident. Unable to withstand loneliness, she throws herself into a river during a storm. She awakens in an old shack. There, Nao witnesses a mysterious man with the exact same face as Arata. "I won't let you go back to him," the man spits out, and forcibly steals Nao's lips. "Please... Stop... Nnh." Sighs spill uncontrollably, and areas that are caressed become hot and moist... She knows the man isn't Arata, but she can't say no. "Nao..." he calls in the same voice as him. Who... are you?