Can anyone suggest me titles of yaoi / shounen-ai manga that displays sweet / affectionate interaction between two men -OR- could be one sided?

What I mean by sweet / affectionate, probably showing care to the other partner or showing the soft side. All in all this manga will give you a good feel after reading it, something like that. ♥

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Junjou by Hyouta Fujiyama

Thank you neenasha! I'll try this one. Hope I could get more suggestions! :')

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I think these will fit -

Haru wo Daite Ita
Wild Rock
Gochisousama
Twin's Labyrinth and Heart Strings
Hidoi Otoko (AOI Akira)
Te wo Tsunaide, Sora wo and other stories by MIYAMOTO Kano
Uso to Kiss
Let's Meet Here Tomorrow, oneshot
Kiraboshi Dial
Rakka Sokudo

Some of the suggestions in the 'slow romance' thread fit here -
FAKE
My Life With You
both these have serious moments, but the romance is sweet.
Hachimitsu Darling

Just about any story by NAONO Bohra leaves me with a good feeling. I recently read and can recommend Three Wolves Mountain, Yume ni Tobu Tori, and the short "Mogura to Taiyou" in Yuuwaku Sentiment.

I've been reading a lot of YAMADA Yugi lately. Dare ga Omae wo Suki dato Itta will suit you, I think.

Thanks scarletrhodelia! I'll check your suggestions! ♥

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Is three guys ok? Check out Thirsty for Love. I think the Yellow guys are sweet too. 🙂

Make me no ones life; make no one mine

I'm always looking for an excuse to recommend this one since it's my favourite: Love mode
The Seme is so nice, affectionate and caring and you feel so sorry for him when the uke gets nasty lol.
Unfortunately it's just the seme that's affectionate.

It's annoying me that I'm sure there's another awesome manga like this that I can recommend but the name is evading me, I'll edit when I find it.

Thanks for your suggestions! I'll check all of it. Although I'm already familiar with some of the titles your suggesting me but I'm still thankful!

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I'd suggest Katekyo! I think it is very sweet how the uke loves the seme despite what the seme asks him. Also you can see how mush the seme cares for him! <3 this has to be my favourite yaoi of all time and it's just so frickin' cute! Hehehe I know this is just an excuse to mwntion my favourite manga but it just so cute! >\<
(Sorry m(_ _)m )
P.s. just thaught of it now but the warui series is also really sweet! The first one is warui koto shitai

Honto Yajuu? I think that's pretty sweet.

Senobi no Housoku
Kono Ore ga Omae Nanka Suki na Wakenai

Definitely, Kono Ore ga Omae Nanka Suki na Wakenai as daddybananas mentioned X3

And personally, I find Aitsu no Daihonmei very sweet. Also, Unlucky Strike =)

Slow Starter (ICHIKAWA Kei) (shonen-ai). Makes me smile like a sucker every time, no matter how many times I read it :3

It's the Art of Time, it's the Art of Life--
Of the player and the craftsman,
Of the writer of songs, of the creator of love,
Of those who will follow, of those who led,
There's no other way in the world ahead ♥

You could try Junketsu Drop? Also, I recommend some cute yaoi here, most of them have affectionate characters: http://www.mangaupdates.com/showtopic.php?tid=38697&page=1#post601835