Lyen Lyéna/Léna vávie imya/ovéa! (Inspired by こちらこそ but not having the same meaning literally)

I am curious with regard to sevighir; is that some form with lenited S as in Thorsten's explanation of echanthel?

Edit: I don't know how one might make ovéa into an adv. due to the long E (-ie > *ovie? *ovéave?), so I used one off vávea.

Aníron Vereth Ethuil veren an ilphen! ;) Harthon Ethuil anglennatha na-vedui na fennas vín egor ruthrathon. :)

Ar... sír, Gwirith vinui i Aur i-Phenhael* vi milbar nín. Aglar 'ni Phenhael! Eglerio, eglerio! :D

[*penhael < pen- + sael, ceno panthael, perhael]

+Matthew Dinse it should be sevigir of course, silly me, and it's from PE17:132. Thanks for catching it!