So both of them died. Afterward he runs into a girl and they both have memory loss, but then they find out that in his past life she was his pet male dog. When he gets thirsty she offers to let him try to drink from her breast, and predictably she gets turned on and wants to mate so she'll be able to sleep without "attacking him." After doggy style and "normal human style" he apologizes for coming inside because they might have kids, and she's cool with it because they'd be master's kids. (I don't want to read anything supernatural into the last page.)