Should I for Dad

Mum and split a bout four months ago so it me and dad, in families you catch each other nude or in comprising situations I once walked in on my parents when having sex, we all catch each other in the nude at times, since mum left us I have seen my dad naked more than ever with and without an erection, I don't mind it did give me a buzz and I went wet seeing dads dick knowing it gave me life, I think he is doing it purposely for me to see, very recently I walked in the bathroom and saw my dad wanking he had just shot his load it was running down his dick, sorry I said and left with a very wet vagina, after he said sorry you saw that only I don't have anybody to relieve me, I could do with some help down there your mum isn't hear to see my deeds its only a relief I want and kept staring at me,

I do feel sorry for him should I or shouldn't I, I want to but what if I did would he want more, I feel its my duty to help him
Beth