「ついでの」in this context


I know 「ついで」like in 「〜るついでに」, but don't know what to make of it in this
context:

あと何年かしたらきっとついでのチョコになっちゃうんだろうけどね。

The context is of a girl getting some Valetine's Day Chocolate.

I would think of it as "Only some more years and you'll eventually turn into a
??? chocolate"




> あと何年かしたらきっとついでのチョコになっちゃうんだろうけどね。  
>  Several years from now, this chocolate will be "ついでの" chocolate, though.

ついでのチョコ roughly means "chocolate prepared since she was preparing chocolate
for someone else", "chocolate not made for the primary purpose", etc. This
sentence means that, several years later, the girl would be preparing
chocolate mainly for someone else whom she loves, and preparing chocolate for
her elder sister only as the secondary purpose.

See: [Difference between ついでに and たびに in the following
example](https://japanese.stackexchange.com/q/29286/5010)

In Japanese Valentine's day culture, there is something called 本命チョコ and
義理チョコ.

[Valentine's Day, Japan: A How-to
Guide](https://www.tofugu.com/japan/valentines-day-japan/)

> ### GIRI-CHOCOLATE (義理チョコ)
>
> Giri-Chocolate means “obligatory chocolate.” This kind of chocolate refers
> to the chocolate you have to give to people (who aren’t really people you
> love). These could be people like bosses, coworkers, male friends, etc.
>
> ### HONMEI-CHOCOLATE (本命チョコ)
>
> Honmei-Chocolate means “favorite chocolate.” This kind of chocolate is the
> kind of chocolate you give to the one you want to express your love to.
> These chocolates tend to be more expensive or possibly even home made.

So the friend is saying the girls is making 本命チョコ for her sister for now, but
it would be 義理チョコ in the near future.




> あと何年かしたらきっとついでのチョコになっちゃうんだろうけどね。  
>  Several years from now, this chocolate will be "ついでの" chocolate, though.

ついでのチョコ roughly means "chocolate prepared since she was preparing chocolate
for someone else", "chocolate not made for the primary purpose", etc. This
sentence means that, several years later, the girl would be preparing
chocolate mainly for someone else whom she loves, and preparing chocolate for
her elder sister only as the secondary purpose.

See: [Difference between ついでに and たびに in the following
example](https://japanese.stackexchange.com/q/29286/5010)

In Japanese Valentine's day culture, there is something called 本命チョコ and
義理チョコ.

[Valentine's Day, Japan: A How-to
Guide](https://www.tofugu.com/japan/valentines-day-japan/)

> ### GIRI-CHOCOLATE (義理チョコ)
>
> Giri-Chocolate means “obligatory chocolate.” This kind of chocolate refers
> to the chocolate you have to give to people (who aren’t really people you
> love). These could be people like bosses, coworkers, male friends, etc.
>
> ### HONMEI-CHOCOLATE (本命チョコ)
>
> Honmei-Chocolate means “favorite chocolate.” This kind of chocolate is the
> kind of chocolate you give to the one you want to express your love to.
> These chocolates tend to be more expensive or possibly even home made.

So the friend is saying the girls is making 本命チョコ for her sister for now, but
it would be 義理チョコ in the near future.

