Yes, I am aware of delay, but 4 months is a bit beyond the norm. It' questionable.
Rape victims have come out years later, this is not beyond any norm.
Yes, it is. About half of rape victims don't report at all. A good number report immediately or wait a day or a few days (and any delay makes prosecution difficult). There are very few cases of waiting months or years and all the cases I'm aware of are in conjunction with subsequent rapes/abuse where previous victims come forward. I don't believe I've ever heard of a case where the victim waited months or years and then came forward without any particular reason.
And regardless, it is still a question to be asked: Why exactly did he delay? What prompted him to come forward 4 months later? Note that I am NOT saying the delay means he was not raped or is proof that he is lying, but it IS something that needs to be addressed.
In a court of law all it takes is a lack of consent. Force and/or coersion are not required to prove rape.
In most states, lack of consent is defined as giving in under force, threat of force, coercion or incapacity. We can discount incapacity, so without force, threat of force, or coercion, how is there lack of consent?
In particluar we can look at Massachusetts Law
Chapter 265 Sec 22:
Whoever has sexual intercourse or unnatural sexual intercourse with a person and compels such person to submit by force and against his will, or compels such person to submit by threat of bodily injury, shall be punished by imprisonment in the state prison for not more than twenty years; and whoever commits a second or subsequent such offense shall be punished by imprisonment in the state prison for life or for any term or years.
Harsher punishment if there is a weapon or if the rape occurs during the commission of an assault, a robbery, or a burglary.