Aggressive drake constantly attacks old female

[Keely Noodle]

Hi, I have 7 indian runners and my drake constantly attacks this one old female that isn't so good on her feet and is just really frail in general. She always runs, sometimes they will mate and others he will sit on top of her then get off again or just peck her neck a lot to the point where she sits alone in the duck house for hours.
Is there a way I can stop this or make it less worse? We can't afford two duck houses so separating is quite hard and I don't like seeing them depressed on their own. My drake is just under a year old and we are currently in the summer.

 

[casportpony]

I think you have to find a way to separate them or find a home for the drake.

 

[chickens really]

He is a bit Randy at his young age. Next breeding season he should calm down a bit..

 

[Lil Drake40]

She needs protection from your drake. Please separate her from him maybe with another female for company. She deserves better and protection.

 

[Keely Noodle]

Thank you all, I'll be sure to separate her. Hopefully he calms down next year.

 

[Miss Lydia]

My Runner drake is now just over 2yrs and he is a bit calmer than his first year.