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Aşk is the noun form of love. So, you can't say "aşk sen". sevişmek means also "to make love", that is not exactly what you want to say as "to love".
In Turkish, aşk is the bigger degree of love. Sevmek is used for normal love, like you can love your mom, your brother or your teacher as a teacher etc. But if you are talking about falling in love, it is aşk or verb form: aşık olmak.
As a very classical example, "seni seviyorum" means I love you. But I guess because we don't use it for normal love, this tells the falling-love event.
For your question; both of your words "aşk sen" and "ile sevişmek seni" don't make sense like this. If you want to say "I love you", then say "seni seviyorum".
I hope you don't want to say this but as a probability, if you want to say "I make love with you" then you may say "seninle sevişirim" 
A note for sonunda's translation, the last one;
"MISS YOU, YOUR WEATHER & YOUR LOVELY COUNTRY"
(I guess you want to say "I miss" and "your weather" as the climate of the country);
Seni, ülkeni ve havasını özlüyorum
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