The question is, why? This is a bad idea. You’re giving away the duties of husband for free, while receiving no wife benefits in return. All the while she’s free to pursue other men. This sounds like a terrible idea to me. Not that you can’t help them once in a while, but to provide “headship”, performing husband like duties indefinitely seems like a waste of time. Help them find an actual husband or become one yourself.Much has been said about the headship over a woman. Is it possible to be a woman's headship without the sexual aspect? I have a few single women friends (without benefits) that welcome my praying over them and giving advice and helping them around their houses. Thoughts?
If the relationships are actually headed towards marriage or you think it might be, then knock yourself out.
We see this in reverse all the time. Women giving away wifely duties (usually sex) for free without any permanent lifelong commitment by the man.