What is this song about?

What is the song Berry and Filth (By Dir en grey) about?

BERRY Lyrics
Daddy mommy sad my favorite ice cream is strawberry
Daddy mommy mad the name of the kitten I love is strawberry
Daddy mommy sad strawberry flows from me
Daddy mommy mad strawberry...

flows from daddy
Daddy mommy bad strawberry flows from mommy
Daddy mommy abuse a bruise on my body, adding another injury
I was born nine years ago and every night, in bed
Together with the cat I go to sleep
In the morning without fail I put plenty of jam on my
favorite bread
Nothing changes, but
Raspberry jam
Deep red ice cream, I'll let it all out
I quietly peeped in daddy's drawer, there was something inside
Carefully I got it out to see
When daddy and mommy settle settle down to sleep
I'll softly creep up
Shall I shoot straight through you?
I'm hungry I'll put jam on my favorite bread and eat it
Pistol right at the forehead
Raspberry jam

FILTH Lyrics
Sadistic sadistic sadistic awaken the sadist
Sadistic sadistic sadistic bury the sadist
Sadistic sadistic sadistic sever the masochist
Sadistic sadistic let's begin this platonically

The sallowed, greedy insects
Are my frustrated sympathisers
Rotten apples inside my gastric juices
Won't you try the soup of sexual desire?
The dripping, oozing pink maggots that
Soak in the formaline of sadistic desire
Rotten strawberries inside of that*
A sour marinee prepared with blood

Filth Hi

Let's see a movie, holding hands like I promised you
Saying farewell in this evening before the apples and strawberries go rotten
The dream stretches forth, while we're kissing like I promised you
Saying farewell to you let's enjoy the Last Supper

Filth Hi

Sadistic sadistic sadistic drain the sadist dry
Sadistic sadistic sadistic sadistical, horror
The sadistic awakening comes forth
Come one, come all and see
Sadistic sadistic synchro prepared retro horror

The festival of carnal desires will begin
The festival of sexual desires will begin
The out of control sadistic festival
The rapid human flesh psycho horror
Orange juice with liver
Sweet curry mixed with kidney
Pescatore prepared with pancreas
The beloved, beloved psycho horror

I think that Berry is about a child that is being abused by their parents then they get revenge by shooting them both in the head and then comitting suicide.
I think that Filth is something about sex and he thinks its degusting even though he likes it.