I don't think you will be able to convince anyone who won't even believe the Tennessee attorney we have on here who explained it all. For others who might not be sure, here's some more info:
Various cases of men convicted of something greater than a minor sexual conduct charge of some sort, with a minor who appeared to have gone with him "willingly":
Nevada - convicted of kidnapping and child *advertiser censored* - faces up to life. 16 year old girl told officers she was with the man willingly.
http://www.dailymail.co.uk/news/article-4370260/Ex-Vegas-teacher-guilty-kidnapping-teen-girl.html
North Carolina - 20 year old man sentenced to 11 years in prison for abduction and statutory rape of his 14 year old "girlfriend".
http://www.reflector.com/News/2016/05/19/Young-man-found-guilty-in-lovers-runaway-case.html
Mississippi - man sentenced to 30 years for kidnapping and statutory rape after his victim ran away to his home.
http://www.wdam.com/story/33003862/verdict-reached-in-jones-county-kidnapping-and-rape-trial
Texas - federal enticement of a minor )a federal kidnapping charge) and aiding and abetting after he engaged in a sexual "relationship" with a 13 year old, (their words, not mine) and then picked her up and another 13 year old to have sex with him.
http://www.easttexasmatters.com/new...ens-taking-them-to-ft-worth-for-sex/596239707
Florida - statutory rape - sentenced to 5 - 15 years in prison.
http://www.palmbeachpost.com/news/n...ve-sex-until-marriage/f950mkViWEYQJ3N0fi00pK/
Georgia - statutory rape - sentenced to 8 and 15 years (two different men) in prison.
https://patch.com/georgia/atlanta/c...ced-statutory-rape-involving-13-year-old-girl
New York - statutory rape - sentenced to 184 years. Man had been grooming kid for years beginning at age 13.
http://brooklynda.org/2015/09/10/brooklyn-man-sentenced-to-184-years-in-prison-for-statutory-rape/
So besides federal and state kidnapping charges, or harboring a runaway, etc., this man could be charged with statutory rape of ET under all of the following:
Statutory rape is a class E felony in TN - 1- 6 years in prison.
Aggravated statutory rape is a class D felony in TN - 2-12 years in prison.
Statutory rape by an authority figure is a class C felony in TN - 3-15 years in prison and not eligible for diversion or probation.
http://statelaws.findlaw.com/tennessee-law/tennessee-rape-and-sexual-assault-laws.html
http://www.socratek.com/StateLaws.aspx?id=608754&title=39-13-506 Statutory Rape
http://law.justia.com/codes/tennessee/2010/title-39/chapter-13/part-5/39-13-532
If he does not release her, he is looking at serious time, IMO.